SCREW PRESS

• US 3,842,652 A
• Filed: 12/29/1972
• Issued: 10/22/1974
• Est. Priority Date: 12/28/1971
• Status: Expired due to Term

• Current Assignee: Tadahiko Inuki, Toshiya Yonezawa
• Original Assignee: Tadahiko Inuki, Toshiya Yonezawa
• Inventors: Yonezawa, Toshiya, Inuki, Tadahiko
• Primary Examiner(s): Lanham, C. W.
• Assistant Examiner(s): Crosby, Gene P.
• Application Number:
  US05/319,683
• Time in Patent Office: 662 Days
• Field of Search: 72/454 100/289 310/96
• US Class Current: 72/454
• CPC Class Codes: B30B 1/181 the screw being directly driven by an electric motor
• CPC Class Codes: B30B 1/22 driven through friction disc means

Abstract

A screw press is provided comprising a frame, a saddle fixed relative to the frame and a slider element adapted to be driven into abutment with the saddle by operation of a screw shaft which is arranged to threadedly engage the frame and which has the slider element mounted at an end thereof. Rotation of the screw shaft to impart thereto a force driving the slider element into engagement with the saddle is effected by electric motor means which include a stator and a rotor, with the rotor being arranged as a flywheel of the press fixedly mounted upon the screw shaft. The stator is arranged to be fixed relative to the rotor and as the driving force imparted to the shaft during operation of the press causes the rotor to move in directions axially of the screw shaft, the stator is constrained to move therewith by slots formed in the frame which extend in directions parallel to the axis of the screw shaft.

Claims

1. A screw press comprising, in combination, a frame, a saddle fixedly mounted relative to said frame, a slider element adapted to be driven into abutment with said saddle, a screw shaft rotatable about a fixed axis and having said slider element operatively connected thereto, said shaft being threadedly engaged upon said frame to impart a driving force to said slider element upon rotation of said shaft about said axis, electrical motor means including a stator and a rotor connected to produce a driving force for said press, said rotor being arranged as a flywheel of said press and being fixedly mounted upon said screw shaft to rotate therewith, and means mounting said stator for movement relative to said frame in directions parallel to said axis but constraining said stator to prevent rotative movement thereof about said axis, whereby said stator and said rotor move together in a fixed relationship relative to each other in directions parallel to said axis during rotation of said shaft.

2. A press according to claim 1 wherein said mounting means comprise a support element having said stator fixedly mounted thereupon and extending between said screw shaft and said frame, means freely rotatively connecting said support element to said screw shaft but preventing relative axial motion therebetween, slot means formed in said frame extending parallel to said axis, and slot engaging means formed on said support element and arranged for sliding engagement with said slot means.

3. A press according to claim 1 wherein said rotor comprises a generally disc-shaped configuration having an outer peripheral surface and wherein said stator is located adjacent said peripheral surface and spaced radially therefrom to provide an interspacing clearance therebetween.

4. A press according to claim 1 wherein said rotor comprises a generally disc-shaped configuration having a planar surface arranged perpendicularly to said axis and extending radially therefrom, and wherein said stator is located adjacent said planar surface and spaced therefrom axially of said screw shaft to provide an interspacing clearance therebetween.

5. A press according to claim 1 wherein said stator comprises a plurality of segmental stator elements arranged symmetrically relative to said rotor about said axis.